The primary change is the automatic triggering of the completion dialog as you type. This is still an experimental change, and may be disabled by default in the future. It's configurable via three new settings, auto_complete, auto_complete_delay and auto_complete_selector, which are documented in the default file settings. If you find the auto complete popup too distracting, try setting auto_complete_delay to 200 or more: this will make it popup only when typing has paused. I'm keen for feedback on how people find this.

There's also a bunch of new API functions providing detailed control over scrolling - let me know if you have any questions about these.

Nevertheless I spotted a small position problem of the popop when using a 2 rows layout and editing the last visible line, see screenshot http://cl.ly/0835071y243h0A0s1W3E. The popup is positioned in the center of the screen and hides automatically in a manner of a second.

Something I wish would be tweaked about the autocomplete: when autocomplete is triggered, it stays up even when you backspace the entire word. It would make more sense if autocomplete closed when you backspace passed the beginning of a word.

Also, SublimeRope shows proposals in the form: "MySuperClass (imported, class)", and when you start typing, ST2 considers the letters in parenthesis while looking for a match, despite the fact that if you select that proposal, only "MySuperClass" gets inserted (ie, in this case, "ported"+CTRL+SPACE shows "MySuperClass (imported, class)" as a match).

It would be REALLY nice if only the text outside the parenthesis was used while matching what is already typed.